Art of wood joining



C. C. JENSEN ART OF WOOD JOINING Filed Feb. 16, 195].

' July 14; 1931.

3 Sheets-Sheet l rllllfllll arffiem July 14, 1931. c. c. JENSEN ART OF WOOD JOINING a 'Sheet-Sheet 2 File d Feb. 16, 1951 ART OF C. C. JENSEN Filed Feb; 16, 1931 I WOOD JOINING 3 Sheets-Sheet 5 41 I \igfig 38 E i I 736 IIIIIIIIIIII/ 7 5 .5 V

Patented July 14, 1931 UNITED STATES rarer carrier.

c'AaL-c. innsnrt on cizrcneo, rnzzrrvors ART or wooi) JOINING Application filed February 16, 1931. SerialNo. 516,191.

This invention relates to improvements in the art of 'wood joining and, more especially,

is related to the practice of joining the cor-' 11ers, meeting ends, edges or other parts of;

5 wood structures,andthe like. My invention is especially applicable in connectlon with the formation of a miter In making joints of the kind referred to, it has been customary heretofore to employ a I clamp nail of I-sliaped cross-sect on, that 1s, v

a nail having relatively narrow cross flanges 29 connected by a relatively wide central web. As heretofore practlced, the pieces to be joined were provided with vertical cuts to, I.

' ample, areshownin the following patents:

receive the web of the nail; and when the nail was driven in place, each of the cross flanges j 25 formed a cross cut in the material at the base of the vertical out.

not only the vertical cuts, but also the cross cuts before inserting the nail.

two pieces of material much more closely and tightly together than could be accomplished by the old method where the cross flangesofi the nail themselves form the cross cuts as the nail is driven into place. The vertical cut with the cross cut at the base can also be referred to as a T-cut or a T-groove, in which case the vertical stroke of the T is considered the vertical cut in the material and the cross bar of the T is considered as the cross out. In speaking of the vertical cut, it is to be understood that I mean only that the cut is ordinarily substantially at right angles to the surface of the material in which it is formed. In

speaking of the cross cut as being substantially at the base of the vertical cut, it is to be understood that I mean that such cross cut lies substantially at the inner edge of the vertical cut.

One of the features of my invention is to pre-form in the material I find that by j pro-forming the cross cuts, the cross flanges of the nail will follow these cuts and draw the substantially at rightangles to their meeting faces; and that the cross flanges 10 10 lie in I shall now describe more in detail my improved method of joining pieces of wood and the apparatus used in connection therewith.

In thatform of apparatus shownin the drawingsv Figure 1 is a view infront elevation; Fig.

"2 is a top plan view; Fig. 3 is a view in side elevation, with portions broken away, of the cutting members; Fig. at is a view-taken as indicated by the line 44 of Fig. 3; Fig. 5 is a view of a clamp nail; Fig. 6 is a view showing two pieces of wood joined together; and Fig. 7 is a fragmentary view of the motor support. I As shown in the drawings, attention being directed to Fig. 5, 10 indicates, in general, a metal clamp nail of I shaped crossse'ction. That is, this nail is provided at its edges with relatively narrow cross 10 10 said flanges being connected bya central relatively wide web 10*. I make no claim to the con structlon of the nailltself, as such nails are well known in the art. Such'nails,"for eX- No. 1,368,460, Siegler, Feb. 15, 1921 No. 1,413,737, j v 1,677 ,092, Jensen, J uly10, 1928; No.:1,721,561, Jensen, July 28, 1929; Y I r In Fig. 6, I havesh own two pieces of wood 11 and 12 joined together by the nail 10. It will seenthatthe web 10 'of the nail lies in cuts or slots in the members-11 and 12,

cross cuts substantially at right angles to and at the basesv of the vertical cuts. the joint the vertical cuts with the cross cuts are preformed in the members or pieces to be joined. I shall now describe more in detail the cutter or apparatus for pre-forming these cuts. 2

As shown in the drawings, 13 indicates a suitable base carrying a work-support or table 14, here shown as mounted upon a block 15 slidably positioned upon a suitable guide 16, the feed screw 17 being provided to give the desired adjustment. Numeral 18 indicates a suitable rail at one edge of the worksupport against which the edge of a piece of work (as a wooden piece 11 or 12) may be placed to properly position the same. Nu-

'Jensen, April 25, i 1922; 'No. 7

In making meral 19 may indicate a pusher with a piece 20 operating in a groove 21 across the worksupport, said pusher serving to move the work 11 across the support while the cutting operation is being performed.

The base 13 also carries a vertical member 22 with a dovetailed guide member 23 upon which is vertically slidably mounted the supporting arm 24, a feed screw 25 of usual construction being employed to give the desired vertical adjustment. The supporting arm 24 carries at its end an angular member, including a motor support 26 and a support 27 for the reciprocating saw or cutter. These supports may be adjustably mounted on the end of the arm 24 by means of the retaining screw or bolt 28. The motor 29 is attached to the support 26 by the bolts 30,

the samebeing inserted through slots 31 to permit adjustment of the motor on the support.

The motor shaft 32 carries the rotary saw 33 adapted to cut the vertical slot 34 in the material 11, said slot here being shown as substantially at right angles to the face 35 of the piece of wood.

The support 27 carries a reciprocating saw or cutter. As here shown, this saw or cutter includes a vertical blade 36 provided at its end with the cross teeth 37. The reciprocating saw follows the rotary saw 33 and the blade 36 lies in the vertical slot or cut 34 made by the rotary saw. The cross teeth 37 at the inner edge ofthe blade 36 form the cross cut in the material 11 substantially at the base of the vertical cut. As here shown, the saw blade 36 is carried by a plate 38 to the member 39 adapted to slide in the horizontal guideway 40 in the member 41 carried by the support 27. The member 41 is adapted for vertical adjustment on the support 27 by being.

mounted on the vertical guide 42, the usual vertical adjusting screw 43 being provided.

The motor shaft 32 carries an eccentric wheel 44 upon which is mounted an eccentric collar 45, an annular ball-bearing 46 preferably being provided between the eccentric wheel and the collar. The collar is provided with an extension arm 45 attached to the member 39 so that rotation of the motor shaft will cause reciprocation of the member 39 and, consequently, will also reciprocate the saw 36 with its teeth 37.

In the practice of the invention, the material 11 to be acted upon by the cutter is moved in the direction of the arrow in Fig. 3.

That is, the rotary saw 33 forms the vertical 7 cut first. The reciprocating saw 36 follows in this vertical cut, the cross teeth 37 forming the cross cut substantially at the base thereof.

lVhile I have'shown and described certain V embodiments of my invention, it is to be understood that it is capable of many modificatlons. Changes, therefore, in the con struction and arrangement may be made without departing from the spirit and scope of the invention as disclosed in the appended claims, in which it is my intention to claim all novelty inherent in my invention as broadly as permissible, in view of the prior art.

What I regard as new, and desire to secure by Letters Patent, is:

1. Apparatus for cutting a vertical cut with a cross cut substantially at the base thereof, including; a rotary cutter for cutting the vertical cut; a work support; means for causing relative feeding movement between the rotary cutter and the work; and a reciprocating cutter following the rotary cutter, said reciprocating cutter having a part lying in the vertical cut and provided with cross teeth adapted to make a cross cut substantially at the base of the vertical cut.

2. Apparatus as claimed in claim 1, in which the reciprocating cutter is driven by an eccentric attached to the rotary cutter.

In witness whereof, I have hereunto set my hand this 13th day of February, 1931.

CARLC. JENSEN. 

